Looking for a word that expresses "Area of Interest", "Sphere of Interest" basically a word that expresses everything a person may be interested in.
Google translate says "Rem" means interest, but translating "rem" back to English says "business". Is this correct?

Welcome to the site and thanks for a good question! I appreciate accepting my answer, but please also remember to vote up all answers (not just to this question!) you find useful. The suggestion by luchonacho is a good one.
– Joonas Ilmavirta♦May 15 at 16:31

When you say "word", do you really mean one word, and not an expression?
– luchonachoMay 15 at 17:36

4 Answers
4

Let me comment on the translation offered by Google Translate.
Rem is an accusative form of res.
Unless there is more context, I would recommend using the nominative.

The noun res is perhaps the broadest noun in Latin.
It can be reasonably translated as "interest" or "business" in a suitable context, but the basic translation is often given as "thing".
I might even give the rule of thumb that when you need a Latin noun and don't know which one would be appropriate, use res.

The bottom line is that res (which looks the same in singular and plural) can be used for "area of interest" and is idiomatic, but on its own it would not be understood as "area of interest" without proper context.
You could say res meae to mean "my area of interest" just like the literal translation "my things" can mean it.
The Latin res is more formal than the English "thing(s)".
If you want something unambiguous, you will need something else.

Do you mean res alone can be understood as "area of interest"? Can you think of a context/expression/idiom where such is the case?
– luchonachoMay 15 at 17:35

1

@luchonacho I added an example. Res is pretty broad. You can use it to refer to just about anything like the English "thing", but res feels more formal than the English counterpart.
– Joonas Ilmavirta♦May 15 at 18:13

Materia is "subject, argument, course of thought, topic", whereas curiositatis is the genitive of curiositas, curiosity. So, the above would be "topic of curiosity". Res curiositatis is probably also fine, but res seems to be much broader than materia. Finally, area, although a Latin word itself (and the origin of the English one, it seems), did not have the equivalent English meaning intended in the phrase.

Another possibility is studium, which would denote more keenly felt interest than a general word such as res – one's area of particular interest, one's pet interest, or one's passion. Definition 3 in the Oxford Latin dictionary is:

That which forms the object of one's interest or energy, an aim or concern

For example, in book 14 of Ovid's Metamorphoses, orchard trees are Pomona's area of special interest:

Pomona lived in good king Proca's reign
And none of all the Latin woodland-nymphs
Was cleverer than she in garden lore
Nor keener in the care of orchard trees.
Thence came her name. For in her heart she loved
Not woods nor rivers, but a plot of ground
And boughs of smiling apples all around.
She had no spear, only a pruning-knife
To check too greedy growth and trim to shape
The spreading shoots, or slit the bark and set
A slip for sap to feed a foreign stock.
She never let them thirst; her trickling rills
Watered the twisting fibres of their roots.
This was her love, her passion. Venus' charms
Meant nothing; yet for fear of rustic force
She walled her orchard in to keep away
The sex she shunned.

So if your interest is one of these, and why not? then the translation is res.

But if your interest has more in common with the seven attendants of Philosophia:grammar, rhetoric [eloquence], dialectic; arithmetic, music, geometry, astronomy then choose (quotations from *De Eodem Et Diverso,' last three paragraphs)artes, artium, artibus

studiosius singulis artibus animum applicavi.
I put my mind more intensely to the areas of interest one by one.

lectio, lectionis, lectione.

eum asserentem audivi, lectiones [scilicet disciplinares earumque labores] penitentiam non
I heard him insisting that the areas of interest [particularly the discipline and hard work] were not a matter of regret.